var categories = [
          	{ name: "Books about semantics", value: "Books_about_semantics" },
          	{ name: "Books in semantics", value: "Books_in_semantics" },
          	{ name: "Denotational semantics", value: "Denotational_semantics" },
          	{ name: "General semantics", value: "General_semantics" },
          	{ name: "Lexical semantics", value: "Lexical_semantics" },
          	{ name: "Programming language semantics", value: "Programming_language_semantics" },
          	{ name: "Semantic HTML", value: "Semantic_HTML" },
          	{ name: "Semantic Web", value: "Semantic_Web" },
          	{ name: "Semantic Web Companies", value: "Semantic_Web_Companies" },
          	{ name: "Semantic desktop", value: "Semantic_desktop" },
          	{ name: "Semantic file systems", value: "Semantic_file_systems" },
          	{ name: "Semantic units", value: "Semantic_units" },
          	{ name: "Semanticists", value: "Semanticists" },
          	{ name: "Semantics", value: "Semantics" },
          	{ name: "Wikipedia:Books on Semantic Web", value: "Wikipedia:Books_on_Semantic_Web" },
          	{ name: "Web services", value: "Web_services" },
          	{ name: "Virtual World", value: "Virtual_World" },
          	{ name: "Virtual Reality", value: "Virtual_reality" },
          	{ name: "Virtual communities", value: "Virtual_communities" },
          	{ name: "Virtual reality in fiction", value: "Virtual_reality_in_fiction" },
          	{ name: "Virtual reality communities", value: "Virtual_reality_communities" },
          	{ name: "Virtual avatars", value: "Virtual_avatars" },
          	{ name: "Virtual museums", value: "Virtual_museums" },
          	{ name: "Social media", value: "Social_media" },
          	{ name: "Social networks", value: "Social_networks" },
          	{ name: "Persistent Worlds", value: "Persistent_Worlds" },
          	{ name: "Knowledge representation", value: "Knowledge_representation" },
          	{ name: "Second Life", value: "Second_Life" },
          	{ name: "Social systems", value: "Social_systems" },
          	{ name: "Social information processing", value: "Social_information_processing" }          	
          ];
